Ten people were detained Monday morning as they crossed illegally from the United States into Canada.

Two families were taken into custody by Royal Canadian Mounted Police as they crossed the border in Perry Mills, New York.

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The families, one from Turkey and the other from Sudan, were stopped at the end of Roxham Road as they traveled north on foot. There were at least three children, including an infant.

The dead-end crossing was west of the Champlain border crossing on Interstate 87.

Those arrested took taxis the 30 miles from Plattsburgh to cross into Quebec. A taxi driver said he makes at least three of four trips per day to the crossing.

The trip can cost about $50, or as much as $200, depending on the number of people in the taxi. At least one family told the driver they were fleeing the U.S. because of President Donald Trump.

NBC5's Liz Strzepa said Royal Canadian Mounted Police warned the refugees in English and French that if they crossed illegally, they would be arrested.

RCMP held a press conference about border security and integrity in the location where the refugees crossed. Agents said they were constantly monitoring the border.

"If they're here and they have legal status then we basically cut them loose and they're free to continue on with their travels," one border agent said. "We arrest these people because we have to determine their identity and if their claim is legitimate."

They said that during the past few months, the number of migrants crossing the border illegally has increased significantly, with the biggest increase being in Quebec.

Daniel Labarge has lived on Roxham Road for two years. He said the taxi drop offs have become commonplace in his rural part of Clinton County.

"A lot of them are families with kids, just a wife and kids," he said. "They carry bookbags, suitcases, everything."The Conservatives said the Trudeau government should stop the flow of people illegally crossing the border from the U.S. to seek refugee status.

The tactic is a way to avoid the Safe Third Country Agreement, which prevents most people who've been living in the U.S. from making a refugee claim at an official border crossing on the premise they're already somewhere safe.

Canadian Immigration Minister Ahmed Hussen's office said efforts were underway to address the problem.

In a symbolic move Monday, the Montreal city council passed a motion declaring it as a sanctuary city.

The declaration means undocumented refugees have full access to city services regardless of their status. But groups like Solidarity Across Borders said while the city's gesture was in good faith, it was a limited and largely symbolic measure because it might only give undocumented people a false sense of security.

The Canada Border Services Agency said 452 people made a refugee claim at Quebec land border crossings in January.